Abstract Background: Deficiency of Von Willebrand Factor Cleaving Protease (VWFCP) has been implicated as the cause of Thrombotic Thrombocytopenic Purpura (TTP). TTP is a lifethreatening disease characterised by microangiopathic thrombosis due to accumulation of Ultralarge Von Willebrand Factor (ULVWF) multimers. The clinical features of TTP include microangiopathic haemolysis and thrombocytopenia. TTP is being seen with increased frequency in the context of HIV. However, in the context of HIV infection, cytopenias are often multifactorial in nature and levels of VWFCP in HIV-related thrombocytopenia have not specifically been assessed. This study assessed VWFCP activity in the setting of patients with HIV and thrombocytopenia in the absence of TTP, in order to determine the utility of a VWFCP assay in the diagnosis of HIV-related TTP. Acquired VWFCP deficiency is generally assumed to be due to the presence of autoantibody inhibitors to the enzyme, but limited data are available regarding VWFCP activity in HIV positive TTP patients. There is also currently no assay available for measuring VWFCP activity in our laboratory. Aim of Study: To establish a practical assay for VWFCP activity for routine use in our laboratory. The rapid collagen binding assay, based on the ELISA method of Rick, et al., 2002, was chosen. This was initially used to measure VWFCP activity in patients with HIV with and without thrombocytopenia (of any cause except TTP), in order to ascertain whether assessment of VWFCP activity is likely to be of value in facilitating early diagnosis of HIV related TTP. The ELISA assay was performed to establish cut-off values for VWFCP in HIV negative controls and two HIV positive groups (HIV thrombocytopenia / low platelets and HIV normal platelets). Depending on the outcome of this, the assay could then be performed to assess VWFCP activity in HIV positive patients with TTP. Methods: The rapid collagen binding assay for VWFCP activity was established and optimised for routine use in our laboratory. The cut-off values for percentage Residual Collagen Binding Activity (RCBA) in both HIV negative and HIV positive groups were identified. The assay could then be used to assess VWFCP activity in 20 HIV positive patients with TTP at the time of presentation. In patients with reduced VWFCP activity, patient plasma was mixed with normal pool plasma in a 50:50 mix, to assess for the presence of inhibitors. Correlation of VWFCP activity, inhibitors and other laboratory and clinical parameters were performed. Results: The cut-off values for percentage RCBA in both HIV negative (<37.12%) and HIV positive (<51.51%) patients were established. The % RCBA for the HIV negative control group was statistically significantly different from the HIV positive group with normal platelets (p=0.0001) and from the HIV positive group with low platelets (p=0.0006). The cut-off value in the two HIV positive patient groups was higher than for HIV negative control patients, indicating mildly reduced VWFCP enzyme activity in HIV positive patients (regardless of the platelet count), in the absence of TTP. However, no significant difference in the cut-off value was noted between HIV positive patients with low platelet counts versus HIV positive patients with normal platelet counts (p=0.7783). The assay could therefore be used in HIV positive patients with TTP. VWFCP activity was assessed in twenty HIV positive patients with TTP. Two groups of HIV positive patients with TTP were identified based on VWFCP activity. Six patients (30%) had normal (one borderline) VWFCP activity (RCBA <51.51%), while the remaining 14 patients had severely reduced VWFCP levels (RCBA >90%). Of the patients with reduced VWFCP activity, only 5 patients had a detectable inhibitor, while an inhibitor was not detected in the remaining 8 patients. Conclusion: The rapid collagen binding ELISA assay is a cost effective semi-quantitative assay for the assessment of VWFCP activity. VWFCP activity in HIV positive patients appears to be slightly lower, however is not related to the platelet count. This suggests a slight baseline deficiency of VWFCP in the setting of HIV. The baseline VWFCP cut-off value in HIV allowed assessment of HIV positive patients with TTP. The results suggest heterogeneity of VWFCP activity in HIV-related TTP. A negative result (normal VWFCP activity) does not exclude TTP in patients with HIV-related TTP and other pathogenic factors may therefore be involved.

Made available in DSpace on 2016-08-18T17:27:38Z (GMT). No. of bitstreams: 1 Dissertacao LUIS FERNANDO BOGEA PEREIRA.pdf: 908998 bytes, checksum: a39235dcff5d0b2b802f9a1440dd8254 (MD5) Previous issue date: 2014-04-28 / In 2007 were estimated 9.27 million TB cases, 1.4 million of these were also seropositive for HIV. That same year were 456 000 registered cases of deaths from TB who were also infected with HIV. The association between tuberculosis (TB) and HIV infection affects mortality in two ways: TB presents significant lethality for people infected with HIV, and HIV acts as an indirect cause of the increased incidence of TB. Has to analyze the prevalence and factors associated with TB / HIV in patients with tuberculosis in the state of Maranhão. We conducted a cross-sectional analytical study of time series of TB cases notified in the period 2001 to 2011 in the state of Maranhão, totaling 4,553 cases of tuberculosis. Information was collected from the database of State Department of State Health Information Disease Surveillance System (SINAN). To identify associations between outcome (TB / HIV) and the independent variables (age, sex, race / color, education, middle region, place of residence, clinical type, input type, foreclosure situation), we used regression Poisson with robust adjustment of variance. Prevalence ratios (PR) and the ranges of 95 % confidence intervals (95 % CI) were estimated. We found a prevalence of TB / HIV coinfection of 15,1 % in the state. The highest prevalence ranged from 52.9 % in 2001, 11.8% in 2011, and the minimum prevalence ranged of1, 8 % in 2001, 5.9% in 2011. The prevalence of anti - HIV tests ranged from 4.3 % in 2001, 65.9% in 2011. According to the crude analysis, the most significant associations for TB / HIV were males (p ≤ 0.001), age group 20-39 years (p = 0.003) and 40-59 years (p = 0.036) have ≤ 8anos study (p = 0.001), be transferred (p = 0.053), living on the west mesoregion state (p = 0.009) and have closure for oncompliance (p = 0.016) or death (p ≤ 0.001). In the adjusted analysis, both males, age 29-30 years ≤ 8 years, living in the middle region west of the state, like having closure due to death, proved significant for TB / HIV coinfection. On the other hand, the non-white category and Pulmonary TB is presented both as a protective factor in the crude analysis as adjusted, and age ≥ 60 years in only adjusted. High rate of TB / HIV in the state (15,1%), being clear that young males with low education may be contributing to this increase was observed. There needs to adopt specific strategies to monitor this clientele, seeking to reduce the rate of coinfection. / Em 2007 foram estimados 9,27 milhões de casos de TB no mundo, destes 1,4 milhão também eram soropositivos para o Vírus da Imunodeficiência Humana (HIV). Nesse mesmo ano foram registrados 456 mil casos de mortes por TB que também estavam infectados pelo HIV. A interação entre o Mycobacterium tuberculosis e o Vírus da Imunodeficiência Humana (HIV) afeta a mortalidade de duas formas: a TB traz uma importante letalidade para as pessoas infectadas pelo HIV, e o HIV atua como causa indireta do aumento da incidência da TB. Tem-se como objetivo analisar a prevalência e os fatores associados à coinfecção TB/HIV em portadores de tuberculose no estado do Maranhão. Realizou-se um estudo transversal analítico com os casos de TB notificados no período de 2001 a 2011 no estado do Maranhão, totalizando 4.553 casos . As informações foram coletadas a partir do banco de dados do Sistema de Informação de Agravos de Notificação (SINAN) da Secretaria de Estado de Saúde do Estado. Para identificar as associações entre desfecho (coinfecção TB/HIV) e as variáveis independentes (idade, sexo, raça/cor, escolaridade, mesorregião, zona de residência, forma clínica, tipo de entrada, situação de encerramento), utilizou-se a regressão de Poisson, com ajuste robusto da variância. Foram estimadas as razões de prevalência (RP) e os intervalos de 95% de confiança (IC 95%). Encontrou-se uma prevalência geral da coinfecção TB/HIV de 15,1% no Estado. A prevalência máxima variou de 52,9 % em 2001 a 11,8% em 2011, e a prevalência mínima variou de1,8 % em 2001 a 5,9% em 2011. A prevalência de testes anti-HIV realizados variou de 4,3% em 2001 a 65,9 % em 2011. De acordo com a análise bruta, as associações mais significativas para coinfecção TB/HIV foram o sexo masculino (p≤0,001), as faixas etárias de 20 a 39 anos (p=0,003) e 40 a 59 anos (p=0,036), ter ≤ 8anos de estudo (p=0,001), ser transferido (p=0,053), residir na mesorregião oeste do Estado (p=0,009) e ter encerramento por abandono (p=0,016) ou óbito (p≤0,001). Na análise ajustada, o sexo masculino, idade de 29 a 30 anos, ≤8 anos de estudo, residir na mesorregião Oeste do Estado, encerramento por óbito, permaneceram associados à coinfecção TB/HIV. Por outro lado, a categoria não branca e a forma clínica pulmonar apresentaram-se como fator protetor tanto na análise bruta como na ajustada, e a idade≥60 anos somente na ajustada. Foi observada alta taxa de coinfecção TB/HIV no Estado (15,1%), sendo nítido que jovens do sexo masculino com baixa escolaridade e o desfecho do tratamento por abandono ou óbito podem estar contribuindo para este aumento. Há necessidades de se adotar estratégias específicas de acompanhamento dessa clientela, buscando reduzir essa taxa de coinfecção.

No abstract available. / Dissertation (LLM)--University of Pretoria, 2013. / gm2014 / Centre for Human Rights / unrestricted

Philosophiae Doctor - PhD / The global impact of the converging dual epidemics of tuberculosis (TB) and human immunodeficiency virus (HIV) is one of the major public health challenges of our time, because in many countries, human immunodeficiency virus (HIV) and mycobacterium tuberculosis (TB) are among the leading causes of morbidity and mortality. It is found that infection with HIV increases the risk of reactivating latent TB infection, and HIV-infected individuals who acquire new TB infections have high rates of disease progression. Research has shown that these two diseases are enormous public health burden, and unfortunately, not much has been done in terms of modeling the dynamics of HIV-TB co-infection at a population level. In this thesis, we study these models and design and analyze robust numerical methods to solve them. To proceed in this direction, first we study the sub-models and then the full model. The first sub-model describes the transmission dynamics of HIV that accounts for behavior change. The impact of HIV educational campaigns is also studied. Further, we explore the effects of behavior change and different responses of individuals to educational campaigns in a situation where individuals may not react immediately to these campaigns. This is done by considering a distributed time delay in the HIV sub-model. This leads to Hopf bifurcations around the endemic equilibria of the model. These bifurcations correspond to the existence of periodic solutions that oscillate around the equilibria at given thresholds. Further, we show how the delay can result in more HIV infections causing more increase in the HIV prevalence. Part of this study is then extended to study a co-infection model of HIV-TB. A thorough bifurcation analysis is carried out for this model. Robust numerical methods are then designed and analyzed for these models. Comparative numerical results are also provided for each model. / South Africa

This study emanates from the need to understand the socio-economic factors that might have contributed to the patients dropping out of the MASA antiretroviral therapy programme in Botswana. The aim of the study was to explore the socio-economic factors that are involved in compliance to antiretroviral therapy. It is crucial to know what these factors are and the strategies that can be deployed to address them. This will assist in the achievement of the programme goals. The type of research that was used is applied research. One of the primary rationales of applied research is that the study may have some practical use. The purpose of applied research is to contribute knowledge that will help people understand the nature of the problem in order to intervene, and this was the main motivation for this study. Since the MASA programme was launched, there were some patients who were ‘lost to follow-up’. As a result, there was a need to understand the reasons behind this phenomenon, so that the patients who are enrolled on the programme are retained. In order to gain an in-depth understanding of how the socio-economic factors affect compliance with antiretroviral therapy, phenomenology was used as a research strategy. Using the phenomenological strategy helps in understanding the nature or meaning of the respondents’ everyday experiences and to transform experiences into consciousness. The sampling method that was used is probability sampling, utilising availability sampling. The population for this study was HIV positive adults who had dropped out of the MASA Programme at Princess Marina Hospital, IDCC clinic in Botswana. The data collection instrument that was used was the interview schedule. From the conclusions, it is apparent that the socio-economic factors are crucial and should therefore be given more attention if better compliance is to be realised. In the same breath, patients require counselling that will focus, not only on the medical aspects of HIV/AIDS but also on the socio-economic factors. As shown in this study it is predominantly the socio-economic factors that led to patients dropping out of the programme. Social workers can play a critical role in this regard as they are equipped with counselling skills. Lastly, the conclusions and recommendation arising from this study are provided. / Dissertation (MA (Social Health Care))--University of Pretoria, 2007. / Social Work and Criminology / unrestricted

This study presents a qualitative analysis of the dichotomy between official HIV and AIDS policy and its implementation in a Human Rights based, United Nations (UN) agency, located in South Africa. The study demonstrates that although HIV and AIDS policy is an intrinsic part of the commitment of this large organisation, the implementation of the policy, in the form of a Workplace Wellness Programme supported by budgetary resources, is weak and incomplete. The thesis integrates detailed vignettes in drawing attention to how personnel in the South Africa office perceive and experience the implementation of HIV and AIDS policy. Additionally, the voices of bureaucrats are also integrated in an effort to interrogate management attitudes and mindsets on matters of policy and treatment of staff. The study explores staff members’ sense of being stigmatised and discriminated, when living with the virus and their responses to it. In this, I bring a personal perspective to the study, by relating my own views of living with a potentially life-threatening disease to the views of the participants in the workplace in which the study is conducted. Classical Weberian and contemporary accounts of ‘bureaucracy’ and the organisational ‘rule book‘ are drawn upon. It is argued that whilst the value systems and politics of managers in the United Nations system lead them to be defined as progressive, some of the practices within their own institutions are contradictory, indifferent and manipulative leading to the perpetuation of discrimination and anxiety amongst HIV-positive staff. Thus, human agency and ingenuity supersedes organisational structure and the rigour of organisational policies and rules. The contradictions highlighted necessitate a careful scrutiny of organisational dynamics, within the wider international development scenario, and organisational introspection within individual UN offices vis-à-vis HIV and AIDS policy implementation. It is envisaged that the study will induce the commissioning of a larger study carried out by an independent body and funded by the United Nations, enabling the validation and enhancement of the argument presented in the case study and provide more recommendations for the way forward for the United Nations. / Thesis (DPhil)--University of Pretoria, 2010. / Sociology / unrestricted

Introduction An estimated 11.4% of South Africans are infected with HIV. As of 2007, 1.7 million people required antiretroviral therapy (ART) and only 460 000 were reported to be on ART. ART can improve the quality of life and socio-economic status for HIV positive patients. This study aimed at evaluating the role played by the different factors in influencing treatment adherence among HIV patients on ART. Methods The study was conducted on patients receiving out-patient ART in two district hospitals (one urban and the other rural) of Mpumalanga Province, South Africa. The study project was approved by the Research and Ethics Committee of the University of Pretoria as well as by the Mpumalanga Provincial Department of Health. This was an analytical, cross-sectional study. The sample size for the study was 490 (245 per site). Facility-based patient appointment registers for the period June-August 2008 were used as the sampling frame. The respondents were selected through systematic random sampling. An interviewer directed standardised questionnaire was administered to the respondents after securing voluntary informed consent. Data were also extracted from the attendance registers in the two facilities. Adherence was measured using the Patient Medication Treatment Adherence Questionnaire. The Pearson chi-square test of association and binary logistic regression analysis were used for identifying significant predictors of non-adherence variables. Results Four hundred and twenty nine questionnaires of the 488 returned questionnaires were analysed. Sixty one questionnaires were disqualified due to incompleteness of data. The response rate was 99.7% in both study areas and participants reported adherence was 92.54%. The median age of the respondents was 36 (IQR, 13), gender distribution was 21.13% males and 78.87% females. The median duration of treatment (in months) with ART was 15 months (IQR, 18). Treatment adherence was higher in the urban than in the rural hospital. The variables that were significantly associated with non-adherence were ‘urban residence’ (OR 0.39 [0.2-0.8]); ‘lack of social support’ (OR 2.74 [1.3-5.7]); Discussion There were also some qualitative variables that had a bearing on quality of healthcare services that could explain differences between the rural and urban sites. Social support and urban residence demonstrated association with treatment adherence. Copyright / Dissertation (MMed)--University of Pretoria, 2010. / School of Health Systems and Public Health (SHSPH) / Unrestricted

The HIV and AIDS pandemic is arguably the greatest threat facing the world today. The pandemic has a far-reaching impact on society, including the workplace. The effect in the workplace is observed in various areas including a reduction in certain skills levels, mortality and declining job performance of employees living with HIV or AIDS. In addition, the fear of discrimination and stigmatisation prevents infected employees from disclosing their HIV status, thus driving the pandemic underground. Despite the potential negative impact that is looming, many employers still do not have any workplace support programmes in place to manage HIV and AIDS in their organisations. However, some employers have implemented workplace support programmes. This research thus explored the influence of workplace support programmes on the job performance of employees that were living with HIV or AIDS. The findings suggest that job performance is positively influenced where workplace support programmes have been implemented. / Industrial and Organisational Psychology / M.Comm. (Industrial and Organisational Psychology)

<p>The devastation caused by the Human Immunodeficiency Virus/ Acquired Immune Deficiency Syndrome (HIV/AIDS) is having a major impact on both the social and economic environment in South Africa. HIV/AIDS hits at the core of the businesses structure - the bottom line. In the absence of a cure for the disease or an effective vaccine, the challenge for all the stakeholders is how to successfully contain and limit the impact of the disease. Intervention programmes such as awareness, knowledge sharing and sero-prevailance testing have the potential to limit HIV/AIDS infections and reduce high-risk behaviours. Whilst education and awareness programmes have been relatively successful in highlighting the dangers of HIV infection, perception, attitudes and behaviours of employees towards HIV/AIDS have dampened voluntary HIV screening initiatives. Many South African organisations have commendable HIV/AIDS education and awareness programmes, however, a concerning fact is that employees are reluctant to avail themselves to voluntary HIV/AIDS testing. Stigmatising attitudes toward persons living with HIV/AIDS may reduce people&rsquo / s willingness to have themselves tested for the Human Immunodeficiency Virus (HIV). This may increase the risk of transmission. It may also lead to increased absenteeism in the workplace, and workdays lost resulting from excessive sick.<br /> <br /> The aim of the study was to establish what the perceptions and attitudes are of employees at different levels of the organisation with regard to HIV/AIDS testing. A further aim was to identify possible reasons for the poor employee response to voluntary HIV/AIDS testing. It was thus important for this research to gauge employee knowledge, attitude and behaviour toward HIV/AIDS in order for organisations to develop strategies for effective HIV/AIDS counselling and testing programmes.<br /> <br /> The data for this study was collected by means of a self report questionnaire. The questionnaire was administered to a sample of employees across all levels of the organisation using the convenient sample approach to identify the respondents. Two hundred and forty six (246) out of a total of 600 questionnaires distributed were returned, making the response rate a credible 41%.<br /> The Statistical Package for Social Science (SPSS) was used to analyse the data obtained from the questionnaire. Both inferential and descriptive statistical approaches were used to analyse the data. The Analyses Of Variance (ANOVA) was used to determine whether differences exist in the perceptions and attitudes of employees at different levels and groupings in the organisation. Additionally post hoc tests (i.e. the Scheffe test) were applied to all comparisons of means after the analysis of variance.<br /> <br /> The findings of this research are important for the role of HIV/AIDS testing and awareness/preventions strategies implemented in South Africa. It provides more insight as to why employees resist HIV/AIDS testing. It can furthermore assist organisations in developing strategies for implementing effective HIV/AIDS awareness and/or prevention programmes. More specifically, the findings identified ways in which organisations can redesign their intervention programmes so as to encourage a greater number of employees to submit to voluntary HIV/AIDS testing.</p>

BACKGROUND: The needle exchange programme (NEP) started in Sweden in 1986 in Lund and shortly after in Malmo. The first NEP in Stockholm opened in spring 2013. The NEP is a service aimed at intravenous drug users (IDU) from 18 years old, with a goal of preventing the blood borne diseases, such as HIV, Hepatitis B (HBV), and Hepatitis C (HCV). With the on going HIV and Hepatitis epidemics, numerous countries around the world have adopted control strategies, such as the NEP to halt the spread of HIV, HBV, and HCV. The objective of this study was to examine if the needle exchange programme has decreased the incidence of HIV, HBV, and HCV in Sweden over a six-year period.  METHODS: Data for incidence and prevalence was extracted from the yearly reports of the Stockholm’s needle exchange programme from 2013 to 2018 and the yearly reports of the public health agency in Sweden from 2013 to 2018. The data was collected for Stockholm, and compared to Västra Götaland, and the whole of Sweden. RESULTS: The incidence of HIV was zero in 2013 and 2015 in the NEP. The incidence of HBV decreased to zero in 2013 in the NEP. There is an increased incidence of HCV in the NEP. CONCLUSION: The NEP has a protective effect through its combination of needle exchange, opiate substitute therapy, counselling, and vaccinations in reducing and stabilising incidences of the infections, in some instances to zero, as well as providing surveillance and treating infections.